Water-cooled furnace door



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INVENTOR.

Levi S. Longenecker BY;

up r1 HIS ATTORNE 5 June 22, 1954 L. S. LONGENECKER WATER-COOLED FURNACE DOOR Filed May l0, 1951 57 #XIX Fig. 22

6 Sheets-Sheet 6 'HRG M fk C) Levi S. Longenec/rer BWL ufmwi HIS ATTORNEYS Patented June 22, 195.4

UNITED STATES PATENT OFFICE WATER-COOLED FURNACE DOOR Levi S. Longenecker, Pittsburgh, Pa.

Application May 10, 1951, Serial No. 225,581

` Claims. 1

This invention relates tofluid or water cooled furnace doors and particularly'to Water cooled doors for furnaces operating at extremely high temperatures such as open hearth furnaces.

One object of this invention is to produce an improved fluid or water cooled furnace door.

Another object is to produce a water' cooled furnace door having a refractory lining through which all of the cooling water passes.

Another object is to produce a water cooled furnace door having a refractory lining which is free to grow in height, thickness and width and through which all of the' cooling water flows.

Another object is to produce a Water cooled door for open hearth furnaces having a basic refractory lining Vreinforced with ferrous metal plates Which assist in holding the refractories in place on their support portion of the door.

Another object `is to produce a water cooled door for open hearth furnaces `'comprising a metal `reinforced basic refractory lining which is supported on a water cooled foot member and is retained in position on such foot member by Water cooled means which extends through the lining from its top to its bottom.

A further Objectis to produce a water cooled door having a basic refractory lining which extends substantially throughout the full widthof the door and through which all of the cooling water flows.

These and other objects I attain by means of the door structure described in the specification Vthe back or olf-furnace side of the door of Fig.

1 with part of the 'back plate removed;

Figure 3 is a sectional view taken on line III- III of Fig. 1, assuming that all of the refractories and the metal parts of the door are in place;

Figure 4 is a sectional View taken'on line IV-IV of Fig. 1;

Figure 5 is a sectional view taken on line V-V of Fig. 1;

Figure 6 is a sectional View taken on line VI-VI of Fig, 1' with the refractory lining removed;

` Figure l is a View taken on line VII-VII of Figure 8 is a sectional view taken on line VIII- VIII of Fig. 2 but on an enlarged scale;

Figure 9 is a sectional View taken on line IX- IX of Fig. 1;

Figure 10 is a sectional View taken on line X-X of Fig. 1;

Figure 11 is a sectional View taken on line XI- XI of Fig. 1

Figure 12 is a sectional view taken on line XII- XII of Fig. 1;

Figure 13 is a top plan view of one of the full width basic refractory tile entering into the mal eup of the refractory lining of the door of this invention;

Figure 14 is a top plan view of one of the half width basic refractory tile entering into the makeup of the refractory lining of the door of this invention;

Figure 15 is a sectional View taken on line XV- XV of Fig. 13 or Fig. 14; f

Figure 16 is an isometric perspective of a full width ferrous metal reinforcing plate enteringr into the make-up of the door lining of this invention;`and

Figure 1'7 is an isometric perspective view of a half width ferrous metal plate entering into the make-up of such door lining.

Figure 18 is a fragmentary View in elevation of a modified door of this invention;

Figure 19 is a sectional view on an. enlarged scale and is taken on line XIX-XIX of Fig. 18 with all except two lower courses of bricks removed;

Figure 20 is a sectional View taken on line XX- XX of Fig. 18;

Fig. 21 is a view taken on line XXI-XXI of Fig. 18 with the lining refractories omitted;

Figure 22 is a View taken on line XXII-XXII of Fig. 18; and

Figure 23 is a furnace-side View of one of the tube turns shown in Fig. 19.

The water cooled door of this invention comprises a hollow body provided with a hollow foot portion and a hollow head portion. The foot and head portions extend substantially throughout the full width of the hollow body and the space between the head and foot portions is lled with a refractory lining material through which a number of spaced vertically extending cooling water conducting pipes extend.

The arrangement is such that the colder cooling Water enters the door adjacent its top, ows downwardly through the refractory lining by Way of the spaced vertically extending pipes and enters the hollow foot portion. It then passes from esibire 3 the foot portion to the bottom of the hollow body and thence ows upwardly through the back wall or panel-like body from which it is discharged adjacent its top.

I thus in effect provide two planes of cooling Water, one which comprises the cold water owing down through the parallel pipes located within the refractory lining and the other the warmed water flowing up through the hollow body from the top of which it is discharged.

In the form of my door shown in Figs. 1 to 12 inclusive, the major part of the hollow body with its hollow foot and head portions is formed as a unitary steel casting. This casting embraces furnace-side wall 25 of the hollow body A, the top and bottom and the furnace-side wall 26 of the foot portion B, the top and bottom and furnaceside wall 21 with the head portion C, the support members 28 for the door operating truck, ribs 29 and 30 and pads 3l (see Figures 2 and 7).

The off-furnace side of hollow body A is closed by a steel plate 32 which may comprise one or more sections which are connected together and to the top and bottom walls of the hollow body, and to ribs 29 and 39 and pads 3l by deposited weld metal as indicated at 33 in Figs. 3-8 inclusive.

In this form, hollow head portion C is blocked off or closed to the hollow body A by means of a plate 34 which is Welded in place as shown in Figs. 3, 4 and 5. A series of spaced vertically extending pipes 35 connects hollow head C and hollow foot B. Cooling water inlet pipes 3-33 pass through openings formed for their reception in body closing plate 32 and in blocking off plate 34 and these pipes are welded in place within such openings.

Hollow head C thus becomes a header or manifold for spaced pipes 35, since all the cooling water entering hollow head C through one or the other or both inlet pipes 36 flows down through the refractory lining by way of such pipes 35.

A series of clean-out plugs 3l one for each pipe 35 are threaded into openings in the top of head portion C in line with said pipes or tubes 3-5. Outlet pipes 33-33 are welded within openings formed for their reception in plate 32 at the top of hollow body A.

Batlle plate sections 39 are welded in place adjacent the base of each pipe or tube 35 in order to cause the water issuing from pipes 35 to flow toward the furnace-side wall 2S of hollow foot B in preference to flowing directly into hollow body A (Figs. 1, 3 and 7).

Clean-out plugs Il@ are threaded into openings in plate 32 adjacent the spaces between baille plates 39.

Refractory lining The refractory lining preferably comprises courses of chemically bonded basic refractory tile. Each course is made up of full width tile 4l and half width tile 42. The full width tile All are provided with three circular depressions F13 in one wide face thereof and three corresponding button-like projections 44 in the opposite wide face thereof. Each full width tile is also provided with a corner notch 45 for engaging one of pipes or tubes 35. Each half width tile is provided with two similar circular depressions in one of its wide faces and two corresponding circular or buttonlike projections in its opposite wide face.

Each course contains two half width tile, all the others being of full width. One of the half width tile in each course is located adjacent the center of the course, the other being located at one end. In order to bond the tile (stagger the joints) the end half width tile are located at opposite ends of each two adjacent courses as shown in Figs. 9` and 10, which respectively show sections through the second and third courses from the top of the door of Fig. 1 and which as before pointed out are taken on lines IX-IX and XX of such gure.

Between each two adjacent courses of tile, I provide a row of ferrous metal reinforcing plates which comprise two half width plates 48, the remaining plates 49 of each such row being full width. A full width plate is shown in Fig. 16 and a half width plate in Fig. 17. Each full width plate is provided with three circular openings 46 of a size such as will readily encircle one of the tile projections 44 while each half width plate is provided with two such openings.

Each full width plate is provided with a notch 4l adapted to hook around one of the cooling water conducting pipes 35 as shown in Figs. 11

' and 12.

The full width tile shown in Fig. 10 are turned from those shown in Fig. 9 and while the tile of Fig. 9 are not hooked to cooling water pipes 35 they are prevented from sidewise movement relative to the door by reason of the position of pipes 35 with relation to notches 45 of the tile. All of the tile in the courses depicted in Fig. 9, however, are anchored to cooling water pipes 35 by the metal reinforcing plates.

The arrangement of the full width tile shown in Fig. 9 with relation to the pipes 35 prevents movement of the same laterally of the door. The full width tile shown in Fig. 10 are turned 90 so that wall 50 of notches 155 prevents such tile from moving toward the furnace. Since the courses of tile are bonded, the half width tile, by having their projections lying within two of the openings of a full width tile, are prevented from moving laterally of the door and also from moving toward the furnace.

The metal reinforcing plates which embrace the projections on the full width and half width tile assist in preventing the tile from moving toward the furnace side and, since the reinforcing plates in Fig. 12 are shown turned over with regard to those of Fig. l0, they also prevent the tile from moving laterally of the door.

From the construction of the tile and the reinforcing plates shown in Figs. 13-17 inclusive and the arrangement of such tile and plates disclosed in Figs. 9-12 inclusive, it will be seen that the refractory lining which is supported on foot B is securely held in position on such foot by cooling water pipes 35.

Wicket or peep-hole 5l formed of short tubular section as disclosed in Fig. 8 occupies the position usual in such furnace doors and the opening in the refractory lining around the tube sections is packed with a suitable refractory material 52.

In the form of my water cooled door disclosed in Figs. 18-22 inclusive, the hollow body A', hollow foot portion B and hollow head portion C are fabricated from steel plate-like material. The support members 28 for the door operating truck are ralso fabricated from plate-like material.

The hollow head is in open communication with the hollow body which comprises a number of hollow panels A" (Fig. 21) which connect the hollow foot portion B and hollow head portion C on the off-furnace side of the door structure.

Plate-ilike stiffening members 53 secured in position as by welding at spaced positions within hollow foot B', (Figs. 19 and 22),'have theirlower corners trimmed away to facilitate flow of the cooling water within the hollow foot yand from nication with either the interiorof hollow head portion C or body portion A'.

Tubes or pipes 35 are welded within openings formed for their reception in the bottom wall of hollow head portion C and the top wall of foot portion B. provided with an elbow 51 to which a nipple or short section of pipe 58 is threaded. These form a series of nozzles which direct the cooling water issuing from pipes 35 into contact with the furnace-side wall 25 of the hollow foot portion.

This arrangement causes all of the cooling water flowing down through pipes or tubes 35 to contact furnace-side wall 26 prior to entering the hollow body A. Hollow body A is provided with one or more outlets 59 adjacent its top for discharging the heated cooling water therefrom.

Portions of the door structure which receive particularly severe treatment, I provide with tube turns S0 which have their interiors connected to hollow body A so that the cooling water flowing up through such hollow body will also flow through such tube turns. These tube turns are provided with radiating fin-like flanges 6I which project radially therefrom. Each of these flanges has its inner or tube-turn ends curved as shown in Fig. 23 and these fin-like flanges are welded to the tube turns so as to insure good metallic connection.

The space surrounding the tube turns within the refractory lining is lled with plastic basic refractory material 62. It will be noted (compare Figure 18 with Figure 1 and Figure 10 with Figures 3 and 4) that the brickwork row construction shown by the former is otherwise the same as that shown by the latter, except for the cut-out illustrating the brickwork construction of both embodiments of my invention.

What I claim is:

1. An improved fluid-cooled high-temperatureresistant furnace door of the character shown and described which comprises, a metal frame for the door having a panel-like back wall structure defined by vertically-extending and horizontallysegregated hollow enclosures that de'ne up-flow heated-fluid-return passageways, said metal frame also having a horizontally-extending top structure and a horizontally-extending foot structure, said top structure being integrally secured to an upper end of said back wall structure and projecting forwardly thereof and said foot structure being integrally secured to a lower end of said back wall structure and projecting forwardly thereof to define vertically-spaced-apart support ledges, a front refractory lining, said back wall and top and foot structures defining a forwardly and horizontally-endwise-open spacing to The lower end of each pipe 35 is receive said refractory lining, said refractory lining being supported between said ledges and upon said back wall structure, a series of 'horizontallyspaced-apart pipes projecting on a'common vertical plane through and alongsaid refractory lining and in a forwardly-spaced-apartrelationship with respect to said back wall structure, said top structure having horizontally-projecting cooling huid inlet header that is fully closed-off with respect to the hollow enclosures of said back wall and to which upper end portions of said pipes are connected, said foot `structure having a hollow interior connected between'lower end portions of said pipes and lower endu portions of said hollow enclosures of said back wall, said pipes defining fully closed-off down-flowcooling fluid passageways along said refractory lining from said inlet header into the interior of'said foot structure, and said foot structure defining a back-flow heated-huid passageway from said pipes into said hollow enclosures, said top structure having a horizontally-projecting fluid outlet header to which upper end portions of said hollow enclosures are connected and from which heated upflowing fluid is discharged, and means securing said refractory lining on said pipes and horizontally-supporting said lining with respect to the horizontally-endwise-open spacing defined by said top and foot and back wall structures of said metal frame.

2. An improved furnace door as defined in claim 1 wherein, said refractory lining comprises a series of vertically-adjacent horizontal rows of refractory brick, the refractory brick of an alternate set of said series of horizontal rows having pipe-receiving slotted portions that are open horizontally-endwise towards one vertical side end of said refractory lining, and another alternate set of said series of horizontal rows having pipereceiving slotted portions that are open towards an opposite vertical side end of said refractory lining, and the refractory brick of each of said row sets having portions vertically interlocking them with respect to the refractory brick of the other of said row sets.

3. An improved furnace door as defined in claim l wherein, tube turns are mounted on said back wall structure and project forwardly into an imbedded relationship within said refractory lining, and heat-absorbing n elements are secured on said tube turns and project into said refractory lining.

4. An improved furnace door as dened in claim 3 wherein, said fins are of plate-like construction, said refractory lining is cut-out to receive said tube turns and their said ns, and refractory ller material bonds said tube turns and their said fins to said refractory lining.

5. An improved fluid-cooled furnace door of the character shown and described comprising a hollow panel-like vertical body provided with a cooling fluid outlet adjacent its top, a transverse hollow foot member secured to and communicating with said hollow body adjacent its bottom, a transverse hollow top member secured to said hollow body adjacent its top, a refractory lining supported by said foot member, said hollow top member having a cooling fluid inlet header that is closed-off with respect to said hollow body and is positioned above said lining, a series of vertical pipes'spaced from one another and passing vertically through said refractory lining in a spaced relationship from said hollow body, said pipes being connected between said inlet header and said foot member and defining down-flow cooling uid passageways into said foot member, said foot member dening up-ow cooling uid passageways with said hollow body to said cooling uid outlet, tube turns mounted on said hol- References Cited in the le of this patent UNITED STATES PATENTS Number Name Date Re. 17,864 Williams Nov. 11, 1930 1,048,471 St. John Dec. 24, 1912 1,581,817 Sheahan Apr. 20, 1926 Number Number Name Date Christy Nov. 6, 1928 Tone Sept. 9, 1930 Williams Dec. 15, 1931 Bulmer Aug. 8, 1944 Ausland et al July 26, 1949 Richards June 20, 1950 Groetzinger Apr. 3, 1951 Brown et al Dec. 11, 1951 FOREIGN PATENTS Country Date Germany Jan. 9, 1908 France Mar. 8, 1923 Germany June 11, 1929 

